Invoke a JSP error page from a servlet

You can invoke the JSP error page and pass the exception object to it from within a

servlet. The trick is to create a request dispatcher for the JSP error page, and pass the

exception object as a javax.servlet.jsp.jspException request attribute. However, note that

you can do this from only within controller servlets.
If your servlet opens an OutputStream or PrintWriter, the JSP engine will throw the

following translation error:
java.lang.IllegalStateException: Cannot forward as OutputStream or Writer has already been

obtained
The following code snippet demonstrates the invocation of a JSP error page from within a

controller servlet:
protected void sendErrorRedirect(HttpServletRequest request,
HttpServletResponse response, String errorPageURL, Throwable e) throws
ServletException, IOException {
request.setAttribute ("javax.servlet.jsp.jspException", e);
getServletConfig().getServletContext().
getRequestDispatcher(errorPageURL).forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
{
try {
// do something
} catch (Exception ex) {
try {
sendErrorRedirect(request,response,"/jsp/MyErrorPage.jsp",ex);
} catch (Exception e) {
e.printStackTrace();
}
}
}